cmake-cross-compile-test.yml

name: CMake Cross-Compile Test

on: [push, pull_request]

permissions:
  contents: read

jobs:
  cmake-cross-compile-host-vs-target:
    name: Cross-compile x86_64 → ARM64 (shows host/target bug)
    runs-on: ubuntu-latest
    
    steps:
      - uses: actions/checkout@v7.0.1
      
      - name: Install ARM64 cross-compiler
        run: |
          sudo apt-get update
          sudo apt-get install -y gcc-aarch64-linux-gnu
      
      - name: Create ARM64 toolchain file
        run: |
          cat > /tmp/arm64-toolchain.cmake << 'EOF'
          set(CMAKE_SYSTEM_NAME Linux)
          set(CMAKE_SYSTEM_PROCESSOR aarch64)
          set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
          EOF
      
      - name: Configure with DISPATCH (demonstrates bug)
        run: |
          cmake -S build/cmake -B build_cross \
                -DCMAKE_TOOLCHAIN_FILE=/tmp/arm64-toolchain.cmake \
                -DDISPATCH=ON
      
      - name: Build (expected to fail)
        run: |
          # Bug: CMAKE_HOST_SYSTEM_INFORMATION detects x86_64 (host) instead of aarch64 (target)
          # Result: Enables x86 dispatch code which fails to compile for ARM64
          cmake --build build_cross